fix: a11y rule "iframe-has-title" fails with a warning. (#4162)

Co-authored-by: Nick Taylor <[email protected]>

pages/u/[username]/card.tsx

@@ -143,6 +143,7 @@ export default function CardPage({ user }: { user: DbUser }) {
                           border: "none",
                           gridArea: "1 / 1",
                         }}
+                        title={`${username}'s user profile`}
                       ></iframe>
                     </div>
                     <a className="absolute w-full h-full grid place-content-center z-20" href={`/u/${username}`}>